The issue of vacuum stability of standard model (SM) is discussed by embedding it within the TeV scale left-right quark see-saw model. The Higgs potential in this case has only two coupling parameters (lambda (1), lambda (2)) and two mass parameters. There are only two physical neutral Higgs bosons (h,H), the lighter one being identified with the 126 GeV Higgs boson. We explore the range of values for (lambda (1), lambda (2)) for which the vacuum is stable for all values of the Higgs fields till 10(16) GeV. Combining with the further requirement that the scalar self-couplings remain perturbative till 10(16) GeV, we find (i) an upper and lower limit on the second Higgs (H) mass to be within the range: 0.4 a parts per thousand currency sign (M (H) /v (R) ) a parts per thousand currency sign 0.7, where v (R) is the parity breaking scale and (ii) the masses of heavy vector-like top, bottom and tau partner fermions (P (3), N (3),E (3)) have an upper bound a parts per thousand currency sign v (R) . These predictions can be tested at LHC and future higher energy colliders.